The shifting landscape of energy transition investing
Renewable energy infrastructure has long been a cornerstone of institutional portfolios — wind farms, solar parks, and more recently utility-scale battery and energy storage systems (BESS) have attracted significant allocations due to straightforward business fundamentals: government Feed-in-Tariffs and long-term corporate Power Purchase Agreements (PPAs) or Tolling Agreements running 15 – 25 years offer fixed, inflation-linked revenues backed by essential services and physical assets, effectively eliminating market price risk.
For liability-driven investors such as insurers — whose risk frameworks prioritise downside protection over return maximisation — this contractual structure delivers precisely what is needed: long-duration cash flows with limited exposure to market volatility.
That investment proposition is now shifting. PPA durations are shortening and trending below seven to 10 years, contracts are shifting to "Pay-as-Nominated" structures where off-takers pay only for actual demand, and market-linked pricing mechanisms are replacing fixed rates. This introduces merchant price exposure and volume risk into portfolios historically constructed around predictable cash flows.
Paradoxically, the shift is fuelled by renewable energy penetration: rapid deployment without adequate storage has triggered price volatility. Renewables rose to supply 50% of Europe's electricity in 2024, and negative price events reached another record frequency in 2025. Grid infrastructure has not kept pace, with 2,500 GW of renewable projects, including battery storage remaining stuck in global grid queues, according to the International Energy Agency’s (IEA) latest electricity report. This forces curtailment and delays commissioning of planned utility-scale projects, which also weighs on investor returns.
When energy transition infrastructure starts behaving like private equity
These structural changes have fundamentally altered the business model of supply-side infrastructure. Independent power producers are evolving from passive build-and-hold strategies, with private equity firms stepping in to build large platforms suited to managing broad diversified portfolios of renewable assets — combining electricity trading to manage volatility and command higher returns accordingly.
This moves the asset class away from its traditional infrastructure attributes.
Contracted cash flows backed by essential services are being replaced by merchant exposure, active management requirements, and sophisticated trading operations.
For insurers, the challenge is clear: how to maintain a de-risked energy transition allocation whilst preserving the liability-matching, defensive characteristics that define infrastructure as an asset class.
The structural alternative: energy efficiency and behind-the-meter as a de-risked allocation
Behind-the-Meter and Energy Efficiency assets to decarbonise European buildings and industry offer a complementary allocation within energy infrastructure portfolios, delivering long-term, contracted cash flows backed by essential building services and shielded from power price volatility.
Accounting for 40% of EU energy consumption and 50% of gas demand, the building stock represents both the largest source of avoidable energy waste and a central lever for reducing Europe's dependence on imported fossil fuels. Energy efficiency is the most cost-effective way of reducing energy demand across the building stock, with core solutions including heat pumps, LED lighting, building management systems, and rooftop solar.
Case study: financing energy-efficient heating in Germany
Solas Capital's partnership with PAUL Tech AG illustrates the scalability of these technologies and is recognised as a best practice in energy efficiency financing by the European Investment Bank (EIB). PAUL Tech uses AI-driven technology to optimise existing heating infrastructure — requiring no structural alterations to the building with possible commissioning within eight weeks. The technology reduces building energy consumption by 20–40%, delivering immediate cost savings for tenants, and combined with PAUL Tech's heat pump and solar PV integrated solutions, renovated buildings can transition from energy class E to A.
What this looks like in an institutional portfolio context
For insurers, building decarbonisation projects offers predictable, asset-backed cash flows that are structurally well-suited to liability-matching portfolios:
• Long-term off-take agreements provide fixed, fully amortising offtake structures that align naturally with insurance liability profiles, whilst placement behind the meter eliminates exposure to wholesale power price fluctuations.
• Energy for heating, cooling, and industrial processes is non-discretionary — these are the last services cut during economic downturns — creating resilient cash flows across market cycles.
• Physical equipment provides tangible collateral, with performance guaranteed by the energy service company, minimising technology risk.
Beyond financial structure, these investments carry two further advantages specific to insurance investors.
A clean regulatory footprint under the Sustainable Finance Disclosure Regulation (SFDR). Because building decarbonisation investments replace and upgrade existing assets rather than introducing new sources of carbon-intensive activity, they are typically associated with negligible Principal Adverse Impacts (PAIs) under the Sustainable Finance Disclosure Regulation — in most cases actively improving the PAI profile of a portfolio. Beyond PAI considerations, the underlying investments are typically 100% eligible under the EU Taxonomy for Sustainable Activities, qualifying under the climate change mitigation objective for building renovation and making them well-suited to Article 8 and Article 9 fund structures.
Capital efficiency under Solvency II. Structured as senior secured infrastructure debt, these investments qualify for reduced Solvency Capital Requirements under Solvency II — making them amongst the more capital-efficient private debt allocations available to European insurers.
Regulatory tailwinds: a structurally supported investment case
The revised Energy Performance of Buildings Directive (EPBD, 2024) mandates the phase-out of fossil fuel emissions from all new buildings by 2030, introduces Minimum Energy Performance Standards requiring the worst-performing 16% of non-residential floor area to be upgraded by 2030 and 26% by 2033, and mandates a 16% reduction in residential primary energy use by 2030. Across Europe, this creates a €150+ billion annual funding gap. From 2027, the EU Emissions Trading System for Buildings and Transport (ETS2) extends carbon pricing to the built environment.
EU banking regulation reinforces this further: banks are required to disclose the energy performance of their mortgage portfolios through the Green Asset Ratio, and with energy-efficient buildings commanding sale price premiums, financial institutions face growing incentives to improve the energy performance of their lending books.
Conclusion
For insurers, building decarbonisation addresses several portfolio objectives simultaneously. Long-term, de-risked, liability-matching cash flows that define infrastructure as an asset class. By reducing Europe's dependence on imported fossil fuels for heating, the investments contribute directly to energy security. The underlying projects are typically 100% EU Taxonomy-aligned, contribute measurably to net zero goals, carry negligible PAIs, and qualify as infrastructure debt under Solvency II — improving both sustainability reporting and capital efficiency. For liability-driven investors, Energy Efficiency and Behind-the-Meter assets represent the next phase of energy transition investing: reducing demand and decarbonising the built environment, rather than adding supply.
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